Moves lib compilation to gradle
Partially fixes test build

Tests depending on the TestActivity are still failing
since the test manifests doesn't mention it.
Moves project back to root
Makes project dependency relative
Adds gradle wrapper
Updates android plugin
Use gradle version of CWAC-MergeAdapter
Hack: debug/AndroidManifest.xml

Gets tests to work by including a debug manifest that includes
TestActivity. Since it is in debug, releases of the library
will not include it.
Merge branch 'gradle'